Biology Photosyhtesis Flashcards
Biology
What is the word equation for photosynthesis ?
Carbon Dioxide + Water —> Glucose + Oxygen
( can include light energy in arrow )
What is the word equation for respiration ?
Glucose + Oxygen —> Carbon Dioxide + Water
What is the balanced symbol equation for Photosynthesis ?
⁶C0² + ⁶H²O —> C⁶H¹²0⁶ + ⁶0²
Why is light energy needed in Photosynthesis ?
The light energy provides the energy to split the Water molecules into Hydrogen and Oxygen molecules .
What do the Oxygen and Hydrogen molecules get turned into ?
The Oxygen is released into the air whilst the Hydrogen mixes with the Carbon Dioxide into Glucose ?
What does the Glucose get turned into or used for ?
- Energy - For growth and activities
- Starch - For storage incase of winter
- Cellulose - It helps them build strong Cell Walls
- Fats and Oils - Some glucose can be turned into Storage
- Proteins - To help fix and repair ( amino acids )
- Respiration - Key in life
How can it be shown experimentally that photosynthesis had been occurring in a leaf ?
The leaf should be boiled then placed in alcohol . Afterwards it should be rinsed in water and tested for with potassium iodide . Blue/Black means positive
How can we utilise aquatic plants to demonstrate the rate of Photosynthesis ?
We place the leaf in a testube in water then count the oxygwn gas bubbles that emerge
What happens to the light intensity as the source is moved further from a plant and what is the effect on Photosynthesis?
The light intensity decreases and the rate of Photosynthesis decrease
Explain , using data , how the inverse square law describes the effect of distance of light source on light intensity an therefore Photosynthesis?
Inverse square law states that as you move the light further away the light intensity decreases by the square of the distance .
For example if you double the distance the light intensity drops to a quarter of what it was ( 1/2² = 1/4 )
What is meant by a limiting factor ?
A limiting factor is something limits how well a process can happen
What is the ultimate limiting factor in Photosynthesis ?
The ultimate factor is sunlight without sunlight the plant cant do anything
